// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_OZONE_PLATFORM_DRM_GPU_PROXY_HELPERS_H_
#define UI_OZONE_PLATFORM_DRM_GPU_PROXY_HELPERS_H_

#include "base/bind.h"
#include "base/location.h"
#include "base/memory/ref_counted.h"
#include "base/thread_task_runner_handle.h"

namespace ui {

namespace internal {

    template <typename... Args>
    void PostAsyncTask(
        const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
        const base::Callback<void(Args...)>& callback,
        Args... args)
    {
        task_runner->PostTask(FROM_HERE, base::Bind(callback, args...));
    }

} // namespace internal

// Posts a task to a different thread and blocks waiting for the task to finish
// executing.
void PostSyncTask(
    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
    const base::Closure& callback);

// Creates a callback that will run |callback| on the calling thread. Useful
// when posting a task on a different thread and expecting a callback when the
// task finished (and the callback needs to run on the original thread).
template <typename... Args>
base::Callback<void(Args...)> CreateSafeCallback(
    const base::Callback<void(Args...)>& callback)
{
    return base::Bind(&internal::PostAsyncTask<Args...>,
        base::ThreadTaskRunnerHandle::Get(), callback);
}

} // namespace ui

#endif // UI_OZONE_PLATFORM_DRM_GPU_PROXY_HELPERS_H_
